So no, stock throttle bodies do not limit power. The restrictors for most racing classes are much smaller than our throttle bodies. Last ALMS race I was at the prototypes had 2 ~1" restrictors. WRC cars have a single ~38mm. FSAE cars make almost 100hp on a 20mm restrictor. We've got 2 52mm throttle bodies. EACH ONE has more than 6 times the flow area.

The other thing to consider is all the other things in the system that are limiting flow more than the throttle bodies.

-Dan

"Capitalization is the difference between helping your Uncle Jack off a horse, and helping your uncle jack off a horse." "'she' also likes to swap since I think I am going to need to give her to woody again." - Dvlhntr"full alphabetic boost mode" - ChristopherTheOne" Purrs like a sexually satisfied black panther." - BigTDogg"Two oil eating, angry, spinning triangles of death." - turtleboy on rotary engines